*{
    margin: 0;
    padding: 0;
    list-style: none;
}

.box {
    width: 1500px;
    height: 70px;

    nav {
        width: 1263px;
        margin: 0 auto;
        display: flex;

        .frist {
            width: 1050px;
            display: flex;

            li {
                width: 150px;
                height: 70px;
                text-align: center;
                line-height: 70px;
                background: linear-gradient(to top, #bebebe, #fafafa);
                border: 1px solid gray;
                border-image: linear-gradient(#fff, rgba(0, 0, 0, 0.2)) 1;
                position: relative;

                &:hover {
                    background: gray;

                    .second {
                        display: block;
                        height: 280px;
                    }

                }

                .second {
                    position: absolute;
                    top: 100%;
                    left: -1px;
                    height: 0;
                    transition: all 0.3s;
                    overflow: hidden;

                    li {
                        width: 150px;
                        height: 70px;
                        text-align: center;
                        line-height: 70px;
                        background: linear-gradient(to top, #bebebe, #fafafa);
                        transition: all 0.3s;

                        &:hover {
                            background: gray;
                            transition: none;
                            border: 1px solid gray;
                        }
                    }
                }
            }
        }
    }

    .pink {
        width: 1263px;
        height: 100px;
        margin: 0 auto;

        img {
            width: 1263px;
        }
    }

}